Indicates the audio is the official French dub, as opposed to a "VFF" (Version Française de France) which might sometimes refer to a Canadian French dub (VQ).
The search results indicate that " The Reef " is a 2010 Australian horror-thriller film directed by Andrew Traucki. The "TRUEFRENCH HDLight 1080p" part of your query refers to a specific digital release format (high definition, reduced file size, and a "True French" audio dub). Director: Andrew Traucki Genre: Drama, Horror, Mystery & Thriller Runtime: 1h 28min The Reef TRUEFRENCH HDLight 1080p 2010
This specific version is common in French-speaking digital communities: Indicates the audio is the official French dub,